题目：#if #ifdef和#ifndef的综合应用。

程序源代码：

#include stdio.h

#include conio.h

#define MAX

#define MAXIMUM(x,y) (x>y)?x:y

#define MINIMUM(x,y) (x>y)?y:x

void main()

{

int a=10,b=20

#ifdef MAX

printf( \40: The larger one is d\n ,MAXIMUM(a,b))

#else

printf( \40: The lower one is d\n ,MINIMUM(a,b))

#endif

#ifndef MIN

printf( \40: The lower one is d\n ,MINIMUM(a,b))

#else

printf( \40: The larger one is d\n ,MAXIMUM(a,b))

#endif

#undef MAX

#ifdef MAX

printf( \40: The larger one is d\n ,MAXIMUM(a,b))

#else

printf( \40: The lower one is d\n ,MINIMUM(a,b))

#endif

#define MIN

#ifndef MIN

printf( \40: The lower one is d\n ,MINIMUM(a,b))

#else

printf( \40: The larger one is d\n ,MAXIMUM(a,b))

#endif

getch()

}-Title: Integrated application#if#ifdef and#ifndef of.

Source Code:

#include　stdio.h

#include　conio.h

#define MAX

?#define MAXIMUM (x, y) (x> y) x: y

?#define MINIMUM (x, y) (x> y) y: x

void main ()

{

   　int a = 10, b = 20

#ifdef MAX

   　printf ( \ 40: The larger one is　d \ n , MAXIMUM (a, b))

#else

   　printf ( \ 40: The lower one is　d \ n , MINIMUM (a, b))

#endif

#ifndef MIN

   　printf ( \ 40: The lower one is　d \ n , MINIMUM (a, b))

#else

   　printf ( \ 40: The larger one is　d \ n , MAXIMUM (a, b))

#endif

#undef MAX

#ifdef MAX

   　printf ( \ 40: The larger one is　d \ n , MAXIMUM (a, b))

#else

   　printf ( \ 40: The lower one is　d \ n , MINIMUM (a, b))

#endif

#define MIN

#ifndef MIN

   　printf ( \ 40: The lower one is　d \ n , MINIMUM (a, b))

#else

   　printf ( \ 40: The larger one is　d \ n , MAXIMUM (a, b))

#endif

   　getch ()

}